About: http://webisa.webdatacommons.org/172424312

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	A guide ray 10 propagating from point 12 along a surface 14 will follow a straight line path 16, if the surface is a plane, and exit the surface at point 17.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com